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function ExtendedHexDelete()
{
   // Ask user of script for first offset. This is the first byte to delete.
   var sOffset1 = UltraEdit.getString("Offset of first byte to delete (in hex):",1);

   // Do not except an empty string or a string with
   // any character not being a hexadecimal character.
   if (sOffset1.search(/^[0-9A-Fa-f]+$/) < 0) return;

   // Convert the string into a number. (Supported value range unknown!)
   var nOffset1 = parseInt(sOffset1,16);
   if (isNaN(nOffset1)) return;

   // Same as above for second offset. This is the first byte outside the block to keep.
   var sOffset2 = UltraEdit.getString("Offset of first byte to keep outside block (in hex):",1);
   if (sOffset2.search(/^[0-9A-Fa-f]+$/) < 0) return;

   var nOffset2 = parseInt(sOffset2,16);
   if (isNaN(nOffset2)) return;

   // Determine beginning of block and how many bytes to delete.
   if (nOffset2 > nOffset1)      // Block "selection" in standard direction.
   {
      var nBlockBegin = nOffset1;
      var nBytesToDel = nOffset2 - nOffset1;
   }
   else if (nOffset1 > nOffset2) // Block "selection" in reverse direction.
   {
      var nBlockBegin = nOffset2;
      var nBytesToDel = nOffset1 - nOffset2;
   }
   else return;   // Nothing to delete on equal offsets.

   // Go to the begin of the block and delete the bytes.
   UltraEdit.activeDocument.gotoPage(nBlockBegin);
   UltraEdit.activeDocument.hexDelete(nBytesToDel);
}

if (UltraEdit.document.length > 0)  // Is any file opened?
{
   // Is active file opened in hex editing mode.
   if (UltraEdit.activeDocument.hexMode == true)
   {
      ExtendedHexDelete();
   }
}